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<body><h1><a href="http://ejohn.org/blog/processingjs/">Processing.js</a></h1>
<h2>Functions</h2>

<p>The draw_target() function makes it easy to draw many distinct targets. 
Each call to draw_target() specifies the position, size, and number of 
rings for each target.</p>

<p><a href="http://processing.org/learning/basics/functions.html"><b>Original Processing.org Example:</b> Functions</a><br>
<script type="application/processing">
void setup() 
{
  size(200, 200);
  background(51);
  noStroke();
  smooth();
  noLoop();
}

void draw() 
{
  draw_target(68, 34, 200, 10);
  draw_target(152, 16, 100, 3);
  draw_target(100, 144, 80, 5);
}

void draw_target(int xloc, int yloc, int size, int num) 
{
  float grayvalues = 255/num;
  float steps = size/num;
  for(int i=0; i<num; i++) {
    fill(i*grayvalues);
    ellipse(xloc, yloc, size-i*steps, size-i*steps);
  }
}
</script><canvas width="200" height="200"></canvas></p>
<div style="height:0px;width:0px;overflow:hidden;"></div>

<pre><b>// All Examples Written by <a href="http://reas.com/">Casey Reas</a> and <a href="http://benfry.com/">Ben Fry</a>
// unless otherwise stated.</b>
void setup() 
{
  size(200, 200);
  background(51);
  noStroke();
  smooth();
  noLoop();
}

void draw() 
{
  draw_target(68, 34, 200, 10);
  draw_target(152, 16, 100, 3);
  draw_target(100, 144, 80, 5);
}

void draw_target(int xloc, int yloc, int size, int num) 
{
  float grayvalues = 255/num;
  float steps = size/num;
  for(int i=0; i&lt;num; i++) {
    fill(i*grayvalues);
    ellipse(xloc, yloc, size-i*steps, size-i*steps);
  }
}</pre>
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